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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bba3141d065d1ee35b0ee75eacf3d36a3c29bdd22c558e2501423a54c45854d' 
  AND token = '9okjDrHmBu2Xyvw8VNKMobm2KArB6I6uvbnRCEnQpBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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