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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e0618a0ce9816032e987ee7bb387fea64a61aa4599a79303f7b21962f86d615' 
  AND token = 'v0KesQ270AuzA/DLC8fu9/TamvomObN9WHS0fYx/C/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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