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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ff0fc59a169cde4c7150cec8ade69e07fa9cd881259fb33faca3a44bd2a93c' 
  AND token = 'oBKQUkAnWkrRGaK9qEAf+YX3kiT/gpEbpEhod8FEz18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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