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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32f4cb29853631b15a8ebf59131f3e27dfa5cd25122917a9d782978616dade9' 
  AND token = 'ZRFTr5L/hYWMOcmkDUlcMlrDbRoO2rTJu9X3PmT56Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}