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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77834a5419af9289b588a8bf321afbc9a66fc03cae5b9634e63f01961d9edd37' 
  AND token = 'HXEtoZsHgWQ6WRzWLlzDHQBp/nHMSU9l5LIo5gAAl5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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