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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a491a699667f769ea40e35e64f3c7f00291dfc946f5ac0cb2111841d9cf0f639' 
  AND token = 'wLE/hgg3OyEe4F/BIXu9nimt6vxvMknt/mXmVG2jf/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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