SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2faa1d01f0d793aaf5554baeb7646a9b64ed724b912eb46bab1cbf91cbb8f6' 
  AND token = '9uw6Jj+KxaDlQIxgRdvST3qF6oGKYU/ip3t9/jGquzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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