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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67140bcd37d4b8ea0ef98d4bd0cf335b721a19cffd4b4ebeccd276665cc4989' 
  AND token = 'ZPjogg/Gds2qxEfVdc2G93aFXZxjxP6GgXmtv9QUC4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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