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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577d5f746e515eb23914e061b158af28080959aedb0f000c4a7c5bcb75fc0a1e' 
  AND token = 'SNMdWPXnlH5ulnSKvPTTPJp2OwJSIHMTiBqOeG276ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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