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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f14430a9916de1ccfa7f2ccdd8aecc114feab5b96efb559a192ab3ed1c17808' 
  AND token = 'WKVh/mtahUuX8UF/iuzXY3WwyPs4E/22z1r8kyutTZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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