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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696e83fad795bbd478a385c32223ffac551eea2475b225a6f771eb858b7189a7' 
  AND token = 'mpawTSxQE9M21KNGk60fijS4lXmu6SaB039ffGT5YFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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