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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a309fc548f61eaa7cc44b4ebea049e8888792f2d700d418fdae3dea2bd919cd1' 
  AND token = 'udd9dWQX93sIUAPOeh9m8bMAph3D7mrrpsI5aG8Xen4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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