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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf388177e473efb4562102cdc306cf4e916e6f2b6ec82280ee83eecb5110be7' 
  AND token = 'osAfGVU8KDk6e983qVKC5gRAt0LQLI7YU1XVTqB793I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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