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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8338857a6bc80ffa288f8395e6596b69a19c37841e6db6312b714903b7fb9d55' 
  AND token = 'dgfbkbMCIzRg7vBq0nifcDAvHblT8XhIJ5oPveoR6dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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