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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f894550f2ad4b39c94cd2cca6e75b5eedd435b8f9290e33a139b0b87a18ebaf0' 
  AND token = 'bfaV7B3pcqqgJTYmSW84SDuoqg0OYVfTInfSW18OoHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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