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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00288cd81497eca2fca328377d3815d4b3de2544aed448484fd128ab5fcf98c' 
  AND token = 'A6qB7vFeviDaactPoiHn03rP+Crt4l2xUsLJlmj5DJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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