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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9460aee5124805fefd060d06d8aae1059d66e194802a18deb5dcb15e778b79' 
  AND token = 'N+HKKONW5fMqOJPSn65kX7ukdNrboqp6Jo80CwKT9Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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