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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18298aabf82c0a5f3ac2c5541aaca0f42e5c5f85aea5066ddd93f68d79176aac' 
  AND token = 'kyeVuc6tZidiIn7Hnisz+pPPsDMXwBXGrS9lYJ5MSuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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