SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d4619c01ce84af51afdff0ce26673c1c3574ee276f4651f300e2a88b1d357e' 
  AND token = 'UijwbUXSB1vlFAHEiQ9VbgNYBgNJQK1AvYMX24iWmp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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