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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e52524919ac22814c0df8fa99691c903a940f220b502e123aa7661bfc5f3b0' 
  AND token = 'qjcSQVvYnUuQhni7HOtFaQvhOhIIjFwfd3hSuN08/oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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