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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfb93be685578f7b5edd505e40b1df295b6212ad5f04f5ec2871f396ee6698e' 
  AND token = 'eiRrAR0huExzj7cNfQGAzvDTyclRcwZX02lgrvaUwKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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