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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe7961d3710586869ad6ea6c417af41e0003782ccb0f856265d0717e3d84df2' 
  AND token = 'k+56vz3cHYK5jHBwiKdnNc4dCM6fcg1nK42uphhC8Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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