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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf9108d895990406100b76cbba73695585f84e853aecfabade0bd109e3aeb6f' 
  AND token = 'nRO6lZkSBIZZSc1she04E3NVvkbPNUdiCkq0Nsiwt9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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