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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f63990a63d8862cbd6c1889aedd3b59b21a65cef1bcc9f6ab88eee8a4dffb4d' 
  AND token = 'h0e9JsX2FHe/HoXIgWQrQb0VaTLejKjfaiMBU7Yg70A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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