SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5367fa5a985db293172dba892f6358c57347aa88824e24c7e8e483d1a7dff0ec' 
  AND token = 'nG72SnveAzCD9nwhGuYihSvIINDD7IB6zJfLAFEzqsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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