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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae9c878eb40618b08c8d52749a357780798070ede159069532fe879fa17a1dc' 
  AND token = '8t7XkfEQIm2EzM3cwoMr5D+HtDZ2tAWuEOeZGRbpxrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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