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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e139d2f6daeb22104946a36c3b7b3c2c79e3c033cd05e4248cb4786f625d12a5' 
  AND token = 'QK20y0HXsZkd4NUnP6HpoPBkrVHCn6PYIhWgREVaSiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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