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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd265f3565f7a43ba9bc8096070dda0c9e617112d693e9b75018e4d8a94ff437' 
  AND token = '9ABd05ccHpxk8iY+9u/pFu42ro3f0l4Gdvvhq6Mqc2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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