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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39bf8bb8f396cab72ef20e93e082150fb0a919aead8c5ac5d3713ef76de88cee' 
  AND token = 'zzpzo1d3oOt7eyMfyHpau8bG2VZqaWS63tD0S4SFlLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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