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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8719b6f0a7cc69879c04ec0d2d6bf37cf0b09b568ac52e50ed5860a5d2b58ee' 
  AND token = 'NLpelQYaRUSzd5Kq0hmWW+C1ub3oI8SxbayuGzL7mhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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