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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88822beb1bbb6c83689668b90aace0ca6c50cafbb51a87053999cabd7e849f29' 
  AND token = '/y30JXVn70yhnMKZn6jDS1RzDD67PJeyj6v4M4iWu5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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