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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41903a531ebdaadb6bc31b5f6de9dc766b7a880571a0c900adf5c0b581414216' 
  AND token = 'qkTlIIu6jzfJFXiLbLOrUH6JQ8nvEXTW7JI6Au9OxnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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