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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1316b2b4885cac93253cef459c050d83fbe8785b68b6ff7e67d11a0d9db9043' 
  AND token = 'gK9ylcdG3e0GK5yE4Uezad+hfjlwtpbj1i7wHlvTu40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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