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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2442e86e8792fcd897ad48b925c0045fc1f17891f8b27e0c8eb4ed61bd5e08' 
  AND token = 'Zu1WGjXvXRcKVQzr4LR22bSGdnT3jDZOlTSkYY3Z9Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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