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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aeef9068ba540f7d56b07694d1d3b6c70ba4e2367faa3462a51fff955b1167b' 
  AND token = 'DgqtybL7y1X+Xlg3sd2Y109idGWmz6FbZRP3qzN9228=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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