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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1f982dfe9d9ce8f2e61257cdf1245cab889e776dbce6a853c4b1d33f84b4a3' 
  AND token = 'TUuS4BHL1aJ7Pk8lg0AEz4hqX/5MdZxgnCwDC2dFei8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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