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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b052a5c793cdb9b475ddf9c54b839b21f0e49360c7299283a5f845b8731114ef' 
  AND token = 'W8lcU6rMYRJWbdjI1EgxigIvP32+5HTFHhssRkvdgg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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