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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84771277a02f0ccab62b39b8b6da668b5345b62abbbd76f0ce5126cef11b5395' 
  AND token = 'hSmWEunk8erAsNjCc9VCE6jhqeuklCM3G+sT5jGxZf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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