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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27879cdc669f4dc06816f1a458bd5a5100aa6f71b6bba100d76c6ce8418511b5' 
  AND token = 'kcD+UNEuMrdaw7YHLX+jJ/aWPxJk7zyqiywHeK6GqKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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