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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01729e2e0c61e3285a9744c444be26a64e8eb26c2b694dc338b72d271601dff' 
  AND token = '4KsliTcv0tz0KffoTVbCKSUTJb3Aa7xmKc/ZjzUekek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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