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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8b199bf8b3fc72fad1924c77b23d0a4bebc0ac7e69783e51b3ad15b730cdd0' 
  AND token = 'bYKxkM3dAloGh2UGOD6XIyM6eLf8Z8LLRxE8v/QLDwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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