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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271498c35126e296e7aab6ff37bf41f8a94c0037488d53a69cc0da310c7eb2ae' 
  AND token = 'WRKI06s0XbouiRe1Ju9odivPg92Vhzu47m+q9KFAhe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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