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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3369d9317124bf53fed8bd0742af1a1b4500f5e63cf9e6ea42f0a212e53a0bac' 
  AND token = 'WCkKBw8Rk84TpKdqomlFUgRsC+lDfC0cjcxXqC988cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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