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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8ec332ee8b397972341526ae25b3e17b393bca8084b15b0713d9b3680f1728' 
  AND token = 'a1YyRQpNHzz8h/XKc91hgdXPS6d9wJHgczCgeYBS1RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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