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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5a6d2a5c657289ec78bd1b7e515e5f280afbbc3eb34ffbea971904de7a611e' 
  AND token = 'n7qTTg+EVulsgKtN6IM0VHtyahh8TW6fuxUh9Gakp4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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