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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db380f7c0a6ccf0a59ae554fc439f9de2614ff6bcf3f769396343bba7ccf5817' 
  AND token = 'BDoMUmN6vFNM4UkTmwC+bn/Iqh9HBDfnzd4QSlc3i6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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