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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bdd2750c0549e70e069d2534e3d77a4835751f86e42a7e1ea1b9ed3f40e8e0c' 
  AND token = 'HrWFz9Q3nUipbMhQ3IjPsEteC+0YBtwng9zJxho/edA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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