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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da1d31673e2f896fb8d2c97af1d8e27efdb00b94d646c64033be3e964ed0b59' 
  AND token = 'eR0be8dmI0J0hKzwVtIFaNn3dLOHD0ToP/+K1KcQpd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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