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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbaa44d1d9191ad75bd248af3e5dd4c0e86b6422fe47a9ded422ae5e25421eaa' 
  AND token = 'D5xkkiYkJ5RjCK/nYk7OBMF9GDTVvYd3u0KCt7CHNPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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