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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11ac4b824f47a8b2f1dda30e638150e05fc989e03e9e2ab634c865aed913aca' 
  AND token = 'hdpeb4JizAb+vodkDfhwDarNYF+S8ug+HcT9ROS72Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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