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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a893f301374c28560028ac14c806b968abf22f083d1c8c9e3e3e163aed50e533' 
  AND token = '9/53eyTFabC0F5qylmE/5XEbYg4Oz65Dv5AHvi/LMbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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