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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be87de41f71870fbf67e6513ea24091d9dfdaecfe077a21a5a04fbc78bc64ad0' 
  AND token = 'J631dwOMEFFCXQkp6Yqzz6oSuzPOhRhVKpp/+o6WbZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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