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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8da3dd1963f8a2c9c2c45b5137a93be5f3d5b6bc3c8d8218f59d1222a9f92d8' 
  AND token = 'oFp+8Lm4ZhQqWKSqAM5qk3bBREL14n6WsDPyW4PZuxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}