SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc3e41e9f1123e4574c01db61768788592335593a8d3a6241623a50bfa42e39' 
  AND token = '0JtcRZdV6ifhSyCBgW2JK4+G0HGF2VtgC1OpAH/Gou4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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